The Beretta M1951 is a 9 mm semi-automatic pistol, developed during the late 1940s and early 1950s by Pietro Beretta S.p.A. of Italy. The pistol was produced strictly for military use and was introduced into service with the Italian Armed Forces and security forces as the Modello 1951 (M1951), replacing the 9 mm Modello 1934 pistol, chambered for the 9x17mm Short (.380 ACP) cartridge.